Exception when configuring MsSqlTestcontainer

[EnisMulic]

When trying to set Username and/or Database properties in MsSqlTestcontainerConfiguration I get the exception
Object reference not set to an instance of an object. is this an expected behavior?

var config = new MsSqlTestcontainerConfiguration()
{
    Port = 1433,
    Password = "Pa$$w0rd!",
    Username = "TestUser",
    Database = "TestDb"
};


var container = new TestcontainersBuilder<MsSqlTestcontainer>()
    .WithDatabase(config)
    .WithExposedPort(1433)
    .WithPortBinding(1433, 1433)
    .Build();

[HofmeisterAn]

That's on purpose. As far as I know, you can not set the username and database through the MSSQL container start:
https://github.com/HofmeisterAn/dotnet-testcontainers/blob/859826e98e619000ffe5029f088ed9db86946d6f/src/DotNet.Testcontainers/Configurations/Modules/Databases/MsSqlTestcontainerConfiguration.cs#L44

You need to seed your database afterwards.